Chapter 22.6, Problem 3CS

Interpretation Introduction

Interpretation:

The electronic configuration of ${\text{Ce}}^{3+}$ and ${\text{Nd}}^{3+}$ has to be written.

Concept introduction:

The electron configuration tells us in which orbitals the electrons for an element are located. Three rules are,

• Electrons fill orbitals staring with lowest n and moving upwards(Aufbau principle)
• No two electrons can fill one orbital with the same spin(Pauli Exclusion Principle)
• For orbitals within the same subshell, the electrons fill each orbital singly before any orbital gets a second electron (Hund’s rule).

Atomic Number is the number of protons in an atom.